Dot peen mark image acquisition
A mark reader apparatus has a lens and an autofocus system that manipulates the lens in accordance with control signals. An image acquisition system measures a distance from the lens to a dot peened mark. A processor is programmed to: calculate a focus position for the autofocus system that focuses the lens on the dot peened mark; apply an offset to the calculated focus position to produce an offset focus position; control the autofocus system by positioning the autofocus system to the offset focus position; and via the image acquisition system, acquire an image of the mark with the autofocus system set to the offset focus position.
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The present application claims the benefit of U.S. patent application Ser. No. 15/269,020 for Dot Peen Mark Image Acquisition filed Sep. 19, 2016, now U.S. Pat. No. 9,881,194. Each of the foregoing patent application and patent is hereby incorporated by reference in its entirety.
FIELD OF THE INVENTIONThe present invention relates to image acquisition and decoding of dot peened markings such as in direct part marking (DPM). While the present invention was developed for dot peen markings, it may have other applications to similar markings made up of an array of dots without limitation.
BACKGROUNDDirect Part Marking (DPM) technology is used to provide a machine readable code that is a permanent marking of the material of a part or component. This may be accomplished, for example, through dot-peen marking. In dot peen marking, a hard pin (e.g., carbide or diamond tip assembly) is caused to strike the surface of a part to form a pattern of dots that create a permanent mark. Dot peen marking machines can use an electromechanical or pneumatically driven marking pin to stamp (or peen) a series of dots to form the desired marking that may represent, for example, a bar code or quick response (QR) code, text, logos, or 2D Data Matrix codes.
Codes such as QR codes can be used to permanently mark a part or product, but conventional image acquisition and decoding systems designed to read higher resolution inked codes may have difficulty correctly reading the codes generated using dot peen technology. Therefore, a need exists for improvements in the technology for reading dot peened DPM.
SUMMARYAccordingly, in one aspect, the present invention embraces methods and apparatus for machine reading of a dot peened mark.
In an example embodiment, a method consistent with the present teachings involves: measuring a distance from a lens to a dot peened mark; calculating a focus position for an autofocus system that focuses the lens on the dot peened mark; applying an offset to the calculated focus position to produce an focus motor position; controlling the autofocus system by setting the autofocus system to the offset focus position; and acquiring an image of the mark with the autofocus system set to the offset focus position.
In accord with certain embodiments the offset is adequate to cause adjacent dots in the dot peened mark to appear merged in the acquired image. In accord with certain embodiments, the offset is determined prior to applying the offset. In accord with certain embodiments, determining the offset comprises determining an offset value by reference to stored values (e.g., a table or graph). In accord with certain embodiments, determining the offset comprises calculating the offset using one of the following equations:
where the values of α, β and γ, and η are constants that depend on the autofocus mechanism and the lens.
In accord with certain embodiments, the process also involves determining whether or not the image to be acquired is that of a dot peened mark and if not, setting the offset to zero instead of the calculated offset. In accord with certain embodiments, the process also involves decoding the mark at a decoder by using the acquired image of the mark.
Another method involves: measuring a distance from a lens to a dot peened mark; calculating a focus position for an autofocus system that focuses the lens on the dot peened mark; determining an offset to the calculated focus position; applying the offset to the calculated focus position to produce an offset focus position; controlling the autofocus system by positioning the autofocus system to the offset focus position; acquiring an image of the mark with the autofocus system set to the offset focus position; and decoding the mark at a decoder by using the acquired image of the mark.
In certain embodiments, the offset is adequate to cause adjacent dots in the dot peened mark to appear merged in the acquired image. In certain embodiments, determining the offset comprises determining an offset value by reference to stored values (e.g., from a table or graph). In certain embodiments, determining the offset comprises calculating the offset using one of the following equations:
where the values of α, β and γ, and η are constants that depend on the autofocus mechanism and the lens.
In certain embodiments, the process further involves determining whether or not the image to be acquired is that of a dot peened mark and if not, setting the offset to zero instead of the calculated offset.
In another example embodiment, a mark reader apparatus has a lens and an autofocus system that manipulates the lens in accordance with control signals. An image acquisition system measures a distance from the lens to a dot peened mark. A processor is programmed to: calculate a focus position for an autofocus system that focuses the lens on the dot peened mark; apply an offset to the calculated focus position to produce an offset focus position; control the autofocus position by positioning the autofocus system to the offset focus position; and via the image acquisition system, acquire an image of the mark with the autofocus system set to the offset focus position.
In certain embodiments, the offset is adequate to cause spaces between adjacent dots in the dot peened mark to appear merged in the acquired image. In certain embodiments, the processor is further programmed to determine the offset prior to applying the offset. In certain embodiments, determining the offset involves determining an offset value by reference to stored values (e.g., from a table or graph). In certain embodiments, a value of the offset is determined by calculating the offset using one of the following equations:
where the values of α, β and γ, and η are constants that depend on the autofocus mechanism and the lens.
In certain embodiments, the processor is further programmed to determine whether or not the image to be acquired is that of a dot peened mark and if not, set the offset to zero instead of the calculated offset. In certain
embodiments, a decoder decodes the mark by using the acquired image of the mark. In certain embodiments, the autofocus system includes a motor, and the offset is an offset to the motor position.
The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.
The present invention embraces a method and apparatus for dot peen DPM decoding using autofocus apparatus.
In accord with certain example embodiments, the image acquisition system is altered in order to apply an offset to the motor position for an autofocus motor. The distance to the mark is measured and an offset is applied that causes the dots to merge and become easier for machine reading.
With reference to
capture the images sent to the decoder 10. In an example of such a system, the image is captured through a lens 24 whose focus is adjusted by an autofocus motor.
When dot peen DPM marks are decoded using current technology, the decoder is specially adapted to reliably decode the dotted image as compared with more conventional markings. Such decoders are commonly processor based and the algorithms that run on the processor to decode such images can take significant processing time to execute. But, without such specialized algorithms, the marks are often difficult to reliably decode.
In accord with certain embodiments consistent with the present invention, the acquisition process including the autofocus process can be modified so that a more readily decodable image is acquired and sent to the decoder. In this manner, the decoder can decode the mark successfully without the use of dot peen specific decoding algorithms.
In accord with certain example embodiments, the acquisition system and more precisely the autofocus system is modified in order to apply an offset to an autofocus position that is normally calculated according to a measured distance to the mark. This offset results in an image of the mark to be acquired slightly out of focus so that the boundaries of the dots in the dot peened mark are removed or lessened so that the mark is readable by conventional (and faster) decoding algorithms.
In the examples given below, the autofocus system is a motor driven system in which the offset is applied to a motor position. However, generally speaking, the offset can be applied to any autofocus system so that the focus is offset in any suitable manner consistent with the particular autofocus system at hand. Hence, in the discussion that follows, application of an offset to an autofocus motor position is but one example of how a focus offset can be applied generally to any autofocus system.
Intuitively, one would generally feel that the sharpest possible image would yield the best detection. However, in the case of dot peened marks and conventional decoder operation, the representation of the image as an arrangement of dots turns out to be difficult to properly decode. However, when the image is slightly de-focused, conventional decoders interpret the slightly blurred dots which fill spaces between adjacent dots more accurately than if the focus is perfect.
The image shown in
When a small offset is applied to the autofocus motor (which depending on the measured distance to the mark), the dots appear to merge, and the image becomes easier for conventional decoding processes to capture.
The image of
Referring now to
In the present embodiment, the user can set the system into a mode that is adapted for reading dot peen marks and if this mode is enabled at 40, then the system calculates a small autofocus motor offset to be applied to the motor position at 44. This offset is added to the motor position calculation from 36 at 48 and the sum is used to actually position the autofocus motor using an autofocus motor position controller at 52. As a result, the autofocus system adjusts the image acquisition system's lens so that it is slightly out of focus when the image acquisition occurs at 56 so that the decoder 10 is provided with an image in which the spaces between the dots in the dot peened mark are lessened or removed. This permits the decoder 10 to rapidly decode the mark as represented by the image that has been acquired.
In certain example embodiments, the user can select between a dot peen mode in which the offset is applied and another mode in which no offset is applied. In one example, this can be accomplished when not in the dot peen mode at 40, the autofocus motor offset can simply be set to zero at 60 and the process proceeds to 44 with the effects of the offset calculation being overridden to an offset of zero.
In accord with certain example embodiments, a small offset is applied to the autofocus motor position as described above so as to create a slight de-focusing of the image being captured. This causes the spaces between the dots of the dot peened mark to largely disappear. The amount of offset can be established in any number of ways. For example, for varying distances of the reader to the mark, the amount of offset can be determined experimentally by incrementally adding an amount of offset until spaces between dots merge. If too much offset is added, the image may become too out of focus, so the amount of offset for a given distance is adjusted to achieve an image with merged dots and little more. In another example embodiment, the amount of offset can be gradually increased until the captured image is quickly and reliably decoded by the decoder.
For multiple focus distances, a table or graph of suitable offsets can be generated and the correct offset for a given distance can be looked up. In this case such a lookup is considered a “calculation” for purposes of this discussion.
In another example embodiment consistent with the present invention, the offset can be calculated as follows:
If the distance between the dots of the mark and the distance to the mark are known:
where the value of α is an empirically determined constant that depends on the autofocus mechanism and the lens.
If the distance between the dots of the mark and the motor position are known:
Offset=β×distance between the dots of the mark×(γ+motor position) (2)
where the values of β and γ are empirically determined constants that depend on the autofocus mechanism and the lens.
If the distance between the dots of the mark is measured in the image (in pixels):
Offset=η×measured distance between the dots (3)
where the value of η is an empirically determined constant that depends on the autofocus mechanism and the lens.
As discussed above, in certain embodiments, the distance to the mark is measured and then, the motor position is set according to this distance. In other embodiments, a passive autofocus can be used where images taken at various motor positions are analyzed to find the best focus position. In this case, the real distance is not known, but the offset can still be computed using equations 2 and 3 above.
Referring now to
In this example system, the decoder may be a hardware decoder module or may be software or firmware implemented or any combination thereof which in any case is represented by decoder 110.
In this example system, the image acquisition module 120 may also be hardware or software or firmware implemented or any combination thereof. Image acquisition module 120 operates in cooperation with a lens or lens system 124 through which light reflected from the mark is captured. The lens 124 is focused using an autofocus motor 128 that is responsive to an autofocus motor controller 132. Input from the user and output to the user is provided with a user interface 136 (Input/Output or I/O 136).
In operation, the image acquisition module 120 under control by the processor 100 provides a distance measurement to the mark which is to be imaged. The image acquisition module 120 then conveys through processor 100 instructions to the autofocus motor controller 132 that cause the autofocus motor controller 132 to position the motor 128 (and thus lens 124) at a distance that includes the calculated offset so as to provide for a merging of the peened dots. The image acquisition module 120 then captures an image of the mark and sends the image to memory where the image is accessed and decoded by decoder module 110. The input/output 132 can be used by the user in certain embodiments to control whether or not a dot peened image is to be acquired, and thus whether or not an offset is to be applied to the motor position.
An example process of operation of the system of
At 210, the process determines whether or not the user has selected operation in the dot peen mode or not. If so, an offset is calculated at 214 and that offset is added to the focus position (motor position in this example) at 218. The autofocus system is then positioned at 222 to the offset focus position so as to cause the lens to be positioned with the offset thereby merging adjacent dots. The image is then acquired at 226 and the process is done at 230.
In the case where the system is not in the dot peen mode at 210, it is desired that no offset be applied. Hence, the offset value is set to zero at 234. This zero offset overrides any offset calculated at 214 and the motor position at 218 is the same as the motor position calculated at 206.
Those skilled in the art will also appreciate, upon considering the present teachings, that some auto focus systems do not use a motor (for example, a liquid lens autofocus system). However, the present teachings can also be applied to such a system by applying an offset to the focus position of any known autofocus system.
* * *To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:
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In the specification and/or figures, certain embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.
Claims
1. A method, comprising:
- measuring a distance from a lens to a mark;
- calculating a focus position for an autofocus system that focuses the lens on the mark;
- determining whether the mark is a dot peen mark or not; and
- if the mark is a dot peen mark: applying an offset to the calculated focus position to produce an offset focus position; setting the autofocus system to the offset focus position; acquiring an image of the mark with the autofocus system set to the offset focus position; and decoding the mark with a decoder using the acquired image of the mark.
2. The method according to claim 1, comprising selecting by a user between at least one of: dot peen mark reading mode and non-dot peen mark reading mode.
3. The method according to claim 1, wherein the decoding comprises utilizing a conventional decoder used to decode a non-dot peen mark.
4. The method according to claim 1, wherein the decoding comprises utilizing a specialized decoder optimized to read dot peen marks.
5. The method according to claim 1, comprising determining the offset prior to applying the offset.
6. The method according to claim 1, comprising determining the offset by adding offset values incrementally to the calculated focus position until space between dots in the image of the mark are merged in the acquired image.
7. The method according to claim 1, comprising determining the offset by reference to stored values.
8. The method according to claim 1, comprising determining the offset based on one or more of: a distance between dots of the mark, the distance from the lens to the mark, and a focus position.
9. A mark reader apparatus, comprising:
- a lens;
- an autofocus system that manipulates the lens in accordance with control signals;
- an image acquisition system that measures a distance from the lens to a mark; and
- a processor that is programmed to: calculate a focus position for an autofocus system that focuses the lens on the mark; and function in a dot peen decode mode and a non-dot peen decode mode;
- wherein in the dot peen decode mode, the processor is programmed to: apply an offset to the calculated focus position to produce an offset focus position; position the autofocus system to the offset focus position; and acquire an image of the mark with the autofocus system set to the offset focus position;
- wherein in the non-dot peen decode mode, the processor is programmed to: apply an offset setting of zero to the calculated focus position to produce an offset focus position; acquire an image of the mark with the autofocus system set to the offset setting of zero; and decode the mark at a decoder by using the acquired image of the mark.
10. The apparatus according to claim 9, wherein the decoder used in the non-dot peen decode mode is the same as a decoder used in the dot peen decode mode.
11. The apparatus according to claim 9, wherein the processor is programmed to receive a selection by a user between at least one of: dot peen decode mode and non-dot peen decode mode.
12. The apparatus according to claim 9, wherein decoding comprises utilizing a conventional decoder used to decode a non-dot peen mark.
13. The apparatus according to claim 9, wherein decoding comprises utilizing a specialized decoder optimized to read dot peen marks.
14. The apparatus according to claim 9, wherein the processor is programmed to determine the offset prior to applying the offset.
15. The apparatus according to claim 9, comprising determining the offset by adding, by the processor, offset values incrementally to the calculated focus position until space between dots in the image of the mark are merged in the acquired image.
16. The apparatus according to claim 9, comprising determining the offset by reference to stored values.
17. The apparatus according to claim 9, comprising determining the offset by:
- calculating an empirical constant, wherein the empirical constant is dependent upon an autofocus mechanism and the lens; and
- calculating the offset based on one or more of: a distance between dots of the mark, the distance from the lens to the mark, and a focus position.
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Type: Grant
Filed: Jan 25, 2018
Date of Patent: Jun 25, 2019
Patent Publication Number: 20180165491
Assignee: Hand Held Products, Inc. (Fort Mill, SC)
Inventors: Jean Hubert Desvernay (Saint Orens de Gameville), Joël Esponde (Renneville), Vincent Bessettes (Castanet-Tolosan)
Primary Examiner: Ahshik Kim
Application Number: 15/879,645
International Classification: G06K 7/10 (20060101); G06K 7/14 (20060101); G06K 19/06 (20060101);